开发一个简单的java系统，该系统可以对学生信息进行增删改查;(用对象数组实现) 要求： (1)录入学生：键盘录入学生信息，使用数组存储学生信息，要求学号不能重复； (2)删除学生：键盘录入要删除的学生学号，将学生从数组中移除； (3)修改学生：键盘录入要修改学生的学号和修改后的信息，将数组中学生的信息修改； (4)遍历学生: 将所有的学生信息输出到控制台； 学生有如下私有字段属性： 整数类型的学号 stuID 字符串类型的姓名 stuName 整数类型的年龄 stuAge 字符串类型的班级名称 stuClass 浮点类型成绩 stuScore;

好的，下面是一个简单的实现代码，供参考：

import java.util.Scanner;

public class StudentSystem {
    private static final int MAX_STUDENT_NUM = 100; // 最大学生数量
    private Student[] students = new Student[MAX_STUDENT_NUM]; // 学生数组
    private int studentNum = 0; // 学生数量

    public static void main(String[] args) {
        StudentSystem system = new StudentSystem();
        system.run();
    }

    // 主程序入口
    public void run() {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入操作编号：");
            System.out.println("1. 录入学生信息");
            System.out.println("2. 删除学生信息");
            System.out.println("3. 修改学生信息");
            System.out.println("4. 遍历学生信息");
            System.out.println("0. 退出");
            int option = scanner.nextInt();
            switch (option) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    updateStudent();
                    break;
                case 4:
                    listStudents();
                    break;
                case 0:
                    System.out.println("谢谢使用！");
                    return;
                default:
                    System.out.println("无效操作！");
                    break;
            }
        }
    }

    // 录入学生信息
    private void addStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生信息：");
        System.out.print("学号：");
        int stuID = scanner.nextInt();
        if (findStudentIndex(stuID) != -1) { // 学号重复
            System.out.println("学号已存在！");
            return;
        }
        System.out.print("姓名：");
        String stuName = scanner.next();
        System.out.print("年龄：");
        int stuAge = scanner.nextInt();
        System.out.print("班级：");
        String stuClass = scanner.next();
        System.out.print("成绩：");
        float stuScore = scanner.nextFloat();
        students[studentNum++] = new Student(stuID, stuName, stuAge, stuClass, stuScore);
        System.out.println("学生信息录入成功！");
    }

    // 删除学生信息
    private void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除的学生学号：");
        int stuID = scanner.nextInt();
        int index = findStudentIndex(stuID);
        if (index == -1) { // 学号不存在
            System.out.println("学号不存在！");
            return;
        }
        for (int i = index; i < studentNum - 1; i++) {
            students[i] = students[i + 1];
        }
        students[--studentNum] = null;
        System.out.println("学生信息删除成功！");
    }

    // 修改学生信息
    private void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要修改的学生学号：");
        int stuID = scanner.nextInt();
        int index = findStudentIndex(stuID);
        if (index == -1) { // 学号不存在
            System.out.println("学号不存在！");
            return;
        }
        System.out.println("请输入修改后的学生信息：");
        System.out.print("姓名：");
        String stuName = scanner.next();
        System.out.print("年龄：");
        int stuAge = scanner.nextInt();
        System.out.print("班级：");
        String stuClass = scanner.next();
        System.out.print("成绩：");
        float stuScore = scanner.nextFloat();
        students[index].setName(stuName);
        students[index].setAge(stuAge);
        students[index].setClass(stuClass);
        students[index].setScore(stuScore);
        System.out.println("学生信息修改成功！");
    }

    // 遍历学生信息
    private void listStudents() {
        System.out.println("学生信息如下：");
        for (int i = 0; i < studentNum; i++) {
            System.out.println(students[i]);
        }
    }

    // 查找学生在数组中的索引
    private int findStudentIndex(int stuID) {
        for (int i = 0; i < studentNum; i++) {
            if (students[i].getID() == stuID) {
                return i;
            }
        }
        return -1;
    }

    // 学生类
    private static class Student {
        private int id;
        private String name;
        private int age;
        private String stuClass;
        private float score;

        public Student(int id, String name, int age, String stuClass, float score) {
            this.id = id;
            this.name = name;
            this.age = age;
            this.stuClass = stuClass;
            this.score = score;
        }

        public int getID() {
            return id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }

        public String getClass() {
            return stuClass;
        }

        public void setClass(String stuClass) {
            this.stuClass = stuClass;
        }

        public float getScore() {
            return score;
        }

        public void setScore(float score) {
            this.score = score;
        }

        @Override
        public String toString() {
            return "学号：" + id + " 姓名：" + name + " 年龄：" + age + " 班级：" + stuClass + " 成绩：" + score;
        }
    }
}